Gyrowheel

Ever see a bike stand up on its own without training wheels? It can if it’s sporting a Gyrowheel! The disk inside the Gyrowheel spins independently of the wheel itself, creating a force which balances even the shakiest of riders. As your child gets less wobbly, you can turn down the level of assistance and–insert evil laugh–they won’t even notice!

Ride One Here: Think Geek